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Finding the Fourth Proportional to 145,787.80, 218,778.90 and 66,861.40

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Solution

The fourth proportional to 145,787.80, 218,778.90 and 66,861.40 is: 100,336.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,787.80 : 218,778.90 = 66,861.40 : x
  2. Step 2: Convert to fraction form
    145,787.80/218,778.90 = 66,861.40/x
  3. Step 3: Cross multiply
    145,787.80x = 218,778.90 × 66,861.40
  4. Step 4: Simplify right side
    145,787.80x = 14,627,863,544.46
  5. Step 5: Solve for x
    x = 14,627,863,544.46/145,787.80
  6. Step 6: Final answer
    x = 100,336.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.